Windows 8 and 8.1 Forums


Hyper-V host network connection issue

  1. #1

    Hyper-V host network connection issue


    I've been using Hyper-V since Win-8 launch day. I run a Windows 2008 SQL Server VM for app development support, as well as an XP Machine and a couple Linux machines for various testing purposes.

    This has all been working great until this weekend. The Win 8 machine lost its network connection, and after more than a day of troubleshooting what the issue was, I figured out that un-installing Hyper-V fixed the problem. I've now since narrowed that down to the Virtual switch.

    If the virtual switch is set to External, no network access for either host or VMs. If I change to Internal or Private, the Host can access the network (of course the VMs cant)

    Nothing has changed as (except a new router that I bought before I figured out it was HyperV) that would affect the network configuration of my system as far as I can tell.

    I desparately need to start getting some work done, but my work depends on an internet connection and my VMs! My next step will be to reinstall windows, but I REALLY don't want to do that!

    Thanks in advance for any useful advice.

      My System SpecsSystem Spec

  2. #2


    A Finnish ex-pat in Leipzig, Germany
    Posts : 1,452
    Windows 8.1 Pro with Media Center


    Have you tried to delete the external switch and create a new one? Or, in case you have two NICS for instance an additional wireless, create a new external switch using that other NIC?

    Kari
      My System SpecsSystem Spec

  3. #3


    Yes, I've deleted and re-created the virtual switch. I've also uninstalled / reinstalled Hyper-V. Everything works fine, until I configure an External switch. At that point, I have no network access at all. Nothing shows in ipconfig, can't ping any local resources, and the network taskbar icon has a yellow triangle.

    If I change the external switch back to an internal one, network access returns to normal.
      My System SpecsSystem Spec

  4. #4


    A Finnish ex-pat in Leipzig, Germany
    Posts : 1,452
    Windows 8.1 Pro with Media Center


    Could you please post screenshots of your network connections? Both Get-NetAdapter output in Powershell and Control Panel > Network and Internet > Network Connections.

    Kari
      My System SpecsSystem Spec

  5. #5


    Well that was interesting. When I changed the VS from Internal to External to grab the screenshots, the computer froze on the configuring adapter process when clicking apply. I ended up having to uninstall and reinstall hyper-v to get it to work again.

    Anyway, back to square one. With VS set to external, no host network access. change to Private or Internal and network access restored.

    Click image for larger version
    Click image for larger version
    Click image for larger version
      My System SpecsSystem Spec

  6. #6


    A Finnish ex-pat in Leipzig, Germany
    Posts : 1,452
    Windows 8.1 Pro with Media Center


    OK, thanks for the screenshots.

    The switch is up and running, as seen in Powershell screenshot, but it is not connected as shown in Network Connections; when connected it should show the network name instead of Enabled:

    Click image for larger version

    The NIC itself should only show Enabled, not be connected, as it is only there to allow virtual switch to pass through. In your case NIC is connected, switch turned on but not connected.

    What happens if you right click vEthernet (Hyper-V Ext) in Network Connections, do you see Connect in context menu?
      My System SpecsSystem Spec

  7. #7


    There is no connect option on the context menu. I've lost all network connectivity now regardless of what the VS is set too. Replying to this from my phone.
      My System SpecsSystem Spec

  8. #8


    A Finnish ex-pat in Leipzig, Germany
    Posts : 1,452
    Windows 8.1 Pro with Media Center


    A suggestion, something I would try:

    1. Disable Hamachi connection
    2. Disable Hyper-V switch
    3. Disconnect Ethernet cable
    4. Reboot
    5. Reconnect Ethernet
    6. Check that network connection (Internet) on host OK
    7. Enable Hyper-V switch
    8. Check if network connection OK (host and guests)
    9. Enable Hamachi connection
    10. Check if network connection OK (host and guests)


    Kari
      My System SpecsSystem Spec

  9. #9


    No change. I get network access back by uninstalling hyperv completely, then reinstalling. As long as the VS is not external, it works. If I change it between internal and external more than a few times it will eventually lock up and I have to reboot via the reset button.

    I'm beginning to suspect a the NIC driver or some other hardware issue.
      My System SpecsSystem Spec

  10. #10


    A Finnish ex-pat in Leipzig, Germany
    Posts : 1,452
    Windows 8.1 Pro with Media Center


    Me too. As your screenshots revealed, you have the switch enabled but not connected whereas the NIC seems to be connected, when it should be exactly the opposite, NIC enabled but not connected allowing the connected switch to pass through.

    Do you have a spare NIC to test?
      My System SpecsSystem Spec

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